Marine Geoscience Data System
MGL0910 Seismic:Velocity:Model
ETOMO: Three-dimensional (3-D) P-wave and S-wave velocity structure of the upper crust beneath the Endeavour segment of the Juan de Fuca Ridge
This 3-D P-wave and S-wave seismic velocity model was derived from active-source data acquired during the ETOMO 3-D seismic tomography experiment that was conducted during Langseth cruise MGL0910 in 2009 (chief scientists Doug Toomey, Emilie Hooft, William Wilcock). Using a 3-D starting model of crustal velocity from previous tomographic studies of crustal refractions, a joint inversion was performed with Pg and Sg crust refraction arrival times using P-to-S coupling constraints. The model and results are described in Kim et al. (2019). The data file is in ASCII format and contains the following 5 columns: x-local-coordinate (km), y-local-coordinate (km), z-local-coordinate (km), P-wave velocity (km/s), and S-wave velocity (km/s). z is depth below the seafloor. The local coordinate is centered on 47.9826N and -129.0776W and rotated -21N. The data set was generated as part of the projects called ETOMO: Endeavour Seismic Tomography Experiment and, Testing Models of Magmatic and Hydrothermal Segmentation: A 3-D Seismic Tomography Experiment at the Endeavour Ridge. Funding was provided by NSF Ridge 2000 program grants OCE04-54747 and OCE04-54700.
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Marcus G. Langseth
The data have been processed/modified to a level beyond that of basic quality control (e.g. final processed sonar data, photo-mosaics).

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